Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b30c8c61ca01d9…

MALICIOUS

PDF

76.1 KB Created: 2021-06-04 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 92d29c9657cbdc9a953eed3980820b3f SHA-1: 7136937767ce0007aa241dc1f993805b0b42ddb0 SHA-256: f8b30c8c61ca01d9dcf91a3cbaae6c0e31b64b0705bcca6b59dfbfd2df2e5ba2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/pbw?utm_term=packaged+drinking+water+plant+project+report+pdf PDF link annotation
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/9894828925c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_601e80b2299cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5cf05a122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_605fd0e5a30be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6016eb93be08e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_6050766f461ce.pdfIn PDF document text
    • https://koledino.weebly.com/uploads/1/3/4/3/134332835/peselazopo_nibewokumidolu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_6014926f8b6c4.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/vodox.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/16294.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/3939158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_60121988a6f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_606e7548db3d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_605564a2d1c3d.pdfIn PDF document text
    • https://fimudelowuj.weebly.com/uploads/1/3/1/4/131455024/gafevurikafokepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_601ed076c421a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7aa7e747-63a6-445e-9616-e2deed6bf23f/learn_how_to_read_hieroglyphics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77421034-a26d-4947-9e4b-ffdcb06f4d8d/how_to_level_samsung_vrt_plus_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ac92c3f-0903-4d18-bac0-ba68c519f213/gazimo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 5164 bytes
SHA-256: 297f17b3044794cfde1fd6eda04a1b3a1a0962e1a58640ec42b53d444ff2b89c
font_01_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 10644 bytes
SHA-256: 28d401f18fb7db57e1c07298e6847e4dda91c538cacac0c36c5b9cfe818a6a0b
font_02_sfnt_off000114e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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